A perennial weed that can be troublesome mainly due to the fact it is hard to get near them because of their stinging leaves.
Remove the weeds by hand as soon as you see them and wear a pair of thick gloves to prevent being stung
Mature nettles can be pulled out just as easily, the thick surface roots tend to come away too when pulled and any regrowth is usually fairly weak
Spraying with weedkiller will do the job if the weeds are in the garden border. Spray with a systemic weedkiller as this is absorbed through the leaves of the plant and the active ingredient makes its way through the cells of the plant down to the root. It kills these first and then the foliage starts to die off